[issue36982] Add support for extended color functions in ncurses 6.1

[Jeffrey Kintscher]

Jeffrey Kintscher <websurfer at surf2c.net> added the comment:

A new function called curses.has_extended_color_support() will indicate whether the linked ncurses library provides extended color support. It returns true if curses.h defines NCURSES_EXT_COLORS and NCURSES_EXT_FUNCS, indicating that the extended color functions are available. This seems more useful to developers than using an indirect method like trying to set a color-pair greater than 0x7fff and checking for an exception to indicate lack of support.

At first glance, has_extended_color() seems like a better name because it is similar to has_colors(), but the two functions have very different semantics that could confuse developers. has_extended_color_support() indicates available functionality in the underlying ncurses library that is set when the interpreter is compiled and linked, while has_curses() indicates available functionality of the current terminal at run-time.

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versions:  -Python 3.9

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<https://bugs.python.org/issue36982>
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